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C

Receive Text up to a Matching Sequence

See more Socket/SSL/TLS Examples

Demonstrates Socket.ReceiveUntilMatch, which receives bytes until an exact byte sequence is found. The match string is encoded using StringCharset and compared byte-for-byte.

Background. The comparison is case-sensitive with no Unicode normalization. This is useful for reading a message that ends with an application-defined marker delimiting the end of a response.

Chilkat C Downloads

C
#include <C_CkSocket.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSocket socket;
    BOOL bTls;
    int maxWaitMs;
    const char *command;
    const char *response;

    success = FALSE;

    socket = CkSocket_Create();

    //  Connect to the server using TLS.  The 3rd argument enables the TLS handshake after the TCP
    //  connection succeeds; the 4th is the maximum time to wait, in milliseconds.
    bTls = TRUE;
    maxWaitMs = 5000;
    success = CkSocket_Connect(socket,"example.com",5000,bTls,maxWaitMs);
    if (success == FALSE) {
        printf("%s\n",CkSocket_lastErrorText(socket));
        CkSocket_Dispose(socket);
        return;
    }

    //  StringCharset controls the character encoding used when sending and receiving text.
    CkSocket_putStringCharset(socket,"utf-8");
    //  Send a request using a simple application-defined text protocol in which each message ends with a
    //  CRLF.
    command = "STATUS\r\n";
    success = CkSocket_SendString(socket,command);
    if (success == FALSE) {
        printf("%s\n",CkSocket_lastErrorText(socket));
        CkSocket_Dispose(socket);
        return;
    }

    //  Receive bytes until an exact byte sequence is found.  The match string is encoded using
    //  StringCharset and compared byte-for-byte.  Here the server marks the end of its response with an
    //  application-defined marker.
    response = CkSocket_receiveUntilMatch(socket,"<EOM>");
    if (CkSocket_getLastMethodSuccess(socket) == FALSE) {
        printf("%s\n",CkSocket_lastErrorText(socket));
        CkSocket_Dispose(socket);
        return;
    }

    printf("%s\n",response);


    CkSocket_Dispose(socket);

    }